Atlas › Modular forms › Weight 2 › Level 96 › 96.2.a

Newspace 96.2.a: $S_{2}^{\mathrm{new}}(\Gamma_0(96))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign	CM	Elliptic curve
96.2.a.a	1	$\mathbb{Q}$	$q - q^{3} + 2q^{5} + 4q^{7} + O(q^{8})$	+			96b1 rank 0
96.2.a.b	1	$\mathbb{Q}$	$q + q^{3} + 2q^{5} - 4q^{7} + O(q^{8})$	−			96a1 rank 0

Hecke characteristic polynomials

The eigenvalue of $T = T_{5} + 3T_{7}$ generates each orbit's coefficient field; on the newspace its characteristic polynomial factors over $\mathbb{Q}$ as one irreducible factor per orbit:

Orbit	Characteristic polynomial of $T$
96.2.a.a	$x - 14$
96.2.a.b	$x + 10$

Dimensions

Newforms $S_{2}^{\mathrm{new}}(\Gamma_0(96))$	2
Old forms	7
Cusp forms $S_{2}(\Gamma_0(96))$	9
Eisenstein series $E_{2}(\Gamma_0(96))$	15
Modular forms $M_{2}(\Gamma_0(96))$	24

Decomposition of the old subspace

$S_{2}^{\mathrm{old}}(\Gamma_0(96)) =$ $S_{2}^{\mathrm{new}}(\Gamma_0(24))^{\oplus 3}$ $\oplus$ $S_{2}^{\mathrm{new}}(\Gamma_0(32))^{\oplus 2}$ $\oplus$ $S_{2}^{\mathrm{new}}(\Gamma_0(48))^{\oplus 2}$

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.099 s (one thread) and proven: the dimensions are certified, and the characteristic polynomial of $T$ over $\mathbb{Z}$ is reconstructed by CRT past a rigorous coefficient bound.

The engine's checks

dim M^+ at levels [1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96]: [0, 1, 1, 2, 3, 3, 5, 4, 8, 6, 12, 20] (certified at ell = 2147483497)
T = [(5, 1), (7, 3)]; h of degree 2 = 1 x 2 (phi(ord eps) x dim S_k^new); 1 primes, 0 rejected

Open in the notebook · JSON · stored data

Recompute it yourself

In Sage mode at sagebrush.space (or npx sagebrush --sage):

newform_orbits(96, 2)

With the Rust engine (source), in engine/:

cargo run --release -p sagebrush-web --example atlas -- 96:2 1000

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